}
	}
}

// Test xlStorage.VerifyFile()
func TestXLStorageVerifyFile(t *testing.T) {
	// We test 4 cases:
	// 1) Whole-file bitrot check on proper file
	// 2) Whole-file bitrot check on corrupted file
	// 3) Streaming bitrot check on proper file
	// 4) Streaming bitrot check on corrupted file

	// create xlStorage test setup
	storage, path, err := newXLStorageTestSetup(t)
	if err != nil {

```
~ mc admin config set alias/ heal
KEY:
heal  manage object healing frequency and bitrot verification checks

ARGS:
bitrotscan     (on|off)    perform bitrot scan on drives when checking objects during scanner
max_sleep      (duration)  maximum sleep duration between objects to slow down heal operation. eg. 2s

			}
		}
	}
	fmt.Println("Reconstructed", reconstructed, "bytes and verified", verified, "bytes of partial shard with config", string(shardConfig))
}

// bitrot returns a shard beginning at startOffset after doing bitrot checks.
func bitrot(val []byte, startOffset, shardSize int) ([]byte, error) {
	var res []byte
	for len(val) >= 32 {
		want := val[:32]
		data := val[32:]
		if len(data) > shardSize {

					f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0)
					if err != nil {
						t.Fatalf("Failed to open %s: %s\n", filePath, err)
					}
					f.WriteString("oops") // Will cause bitrot error
					f.Close()
					break
				}
			}

			rQuorum := len(errs) - z.serverPools[0].sets[0].defaultParityCount
			onlineDisks, modTime, _ := listOnlineDisks(erasureDisks, partsMetadata, test.errs, rQuorum)

			for i := range staleWriters {
				if staleWriters[i] == nil {
					continue
				}
				if !bytes.Equal(bitrotWriterSum(staleWriters[i]), bitrotWriterSum(writers[i])) {
					t.Errorf("Test %d: heal returned different bitrot checksums", i)
				}
			}
		}
	}

	if c.done != nil {
		xioutil.SafeClose(c.done)
		c.done = nil
	}
	return c.rc.Close()
}

// keepHTTPReqResponseAlive can be used to avoid timeouts with long storage
// operations, such as bitrot verification or data usage scanning.
// Every 10 seconds a space character is sent.
// keepHTTPReqResponseAlive will wait for the returned body to be read before starting the ticker.

				replication: replicationCfg,
			}

			item.heal.enabled = thisHash.modAlt(f.oldCache.Info.NextCycle/folder.objectHealProbDiv, f.healObjectSelect/folder.objectHealProbDiv) && f.shouldHeal()
			item.heal.bitrot = f.scanMode == madmin.HealDeepScan

			sz, err := f.getSize(item)
			if err != nil && err != errIgnoreFileContrib {
				wait() // wait to proceed to next entry.
				if err != errSkipFile && f.dataUsageScannerDebug {

	hr, err = er.healObject(healCtx, bucket, object, versionID, opts)
	if errors.Is(err, errFileCorrupt) && opts.ScanMode != madmin.HealDeepScan {
		// Instead of returning an error when a bitrot error is detected
		// during a normal heal scan, heal again with bitrot flag enabled.
		opts.ScanMode = madmin.HealDeepScan
		hr, err = er.healObject(healCtx, bucket, object, versionID, opts)
	}
	return hr, toObjectErr(err, bucket, object, versionID)

			Key:         config.StorageClassSubSys,
			Description: "define object level redundancy",
		}, config.HelpKV{
			Key:         config.HealSubSys,
			Description: "manage object healing frequency and bitrot verification checks",
		})
	}

	helpMap := map[string]config.HelpKVS{
		"":                          helpSubSys, // Help for all sub-systems.
		config.SiteSubSys:           config.SiteHelp,

//
// If an EOF happens after reading some but not all the bytes,
// ReadFile returns ErrUnexpectedEOF.
//
// If the BitrotVerifier is not nil or not verified ReadFile
// tries to verify whether the disk has bitrot.
//
// Additionally ReadFile also starts reading from an offset. ReadFile
// semantics are same as io.ReadFull.